They are vulgar ways to refer to the female sexual organ, depending on countries and sometimes regions of the same country. Pocha is used in Guatemala and El Salvador, shell in Argentina and Venezuela. There are other equally vulgar terms used in Bedskirts, Chimba and Woodcock in Colombia.Si consider separately the words, pocha means also colorless, or squalid ( if we refer to a person ) and it is a tree in Costa Rica. In relation to shell it is a bivalve animal, but in Colombia it mean effrontery, impudence, boldness.
